Motor controller



Sept. 4, 1923. 1,466,902

A. J. HORTON MOTOR CONTROLLER Filed Oct. 1 1920 INVENTOR Abbe/Ll HoflIon ATTORNEY Patented Sept. 1923.

- UNITED STATES PATENT orluclz.

ALBERT J. HORTON, OF WHITE PLAINS, NEW YORK, ASSIGNOR TO THE CUTLER- WEBIIG. 00., F MILWAUKEE, WISCONSIN, A. CORPORATION OF WISCONSIN.

' moron CONTROLLER.

Application filed October 15, 1920. Serial No. 417,102.

To all whom it may concern:

Be it known that I, ALBERT J. HORTON, a citizen of the United States,residing at White Plains in the county of \Vestchester 6 and Stateof'llew 'York, have invented new and useful Improvements in MotorControllers, of which the following is a full, clear, concise, and exactdescription, reference being had to the accompan ing drawing, forming apart of this speciiibation.

This invention relates to motor controllers.

' Heretofore it has been proposed to employ for motor starting and speedregula- The present invention has among its ob-. g'ects to prov de acontroller of the aforesaid character wherein this diiiiculty isovercome.

@ther objects and advantages of the in vention will hereinafter appear,

The accompanying drawing diagrammatisally illustrates one embodiment ofthe invention which will now be described, it being understood that theinvention is susceptible or various modifications without departing fromthe scope of the. appended claims.

Referring to the drawing, the same illustrates a controller afiordingboth armature and field regulation of a shunt motor 1. This motor isshown as comprisin an armature a and a shunt field winding Thecontroller comprises a rheostat 2 hav ing an armature resistance '1' anda field resistance '1'", a counter-voltage switch 3 for controlling saidarmature resistance and a rela 4'for controlling said field resistance.

T e rheostat comprises a pivoted arm 5, a series of contact buttons 6connected th the motor armature for starting:

resistance r and arranged to be progressively engaged by one end of saidarm, segments 7 and 8 to be engaged by the same end or said arm, aseries of contacts 9 connected to the field resistance r and arranged tobe engaged by theopposite end of arm 5 and segments 10, 11 and 12arranged to be 'engaged by the latter end of said arm. ,The arm 5 has alme connection extending to the hub thereof; and the portion of said armengageable with the contact buttons 6 and segments 7 and 8 is insulatedfrom the remainder of said arm.

The arrangement of contact and segments and the circuit connections aresuch that when the arm 5 is in the position illustrated a circuitextends from line L through the winding of relay 4 by conductor 13 toand through arm 5 to segment 11 by conductoi' 1a to the resistancegr atan intermediate;

point and thence through a portion of said resistance by conductor 15 toand through the motor armature by conductor 16 to .line L. Thusprovision is made for inclusion of two steps of resistance in serieswith the Moreover, the arrangement is such that with the arm 5 inengagement with either the uppermost contact 6 or the segment 7 the sameamount of resistance 9" would be included in the armature circuit butsubject to exclusion as a whole or in part upon response of the switch 3which completes circuit from line L through a portion of the winding ofrelay 4 by conductor 17 to segment 8 and thence to conductor 15 eitherdirectly or through one step of resistance r according to the setting ofthe arm 5.

On "us other hand the arrangement is such that the arm 5 may be movedcounter clockwise to include either one or two additional steps ofresistance 1- for restriction of the running speed of the motor underlight load conditions circuit then being traceable from arm 5 to segment12 by conductor 18 to segment 8 and thence through the insulated sectionof the arm 5 to'one or the other of the lowermost resistance contacts 6.for normal inclusion of the additional resistance. Under suchconditions response of the countervoltage switch merely parallels thecircuit to segment 8 thus being without effect upon the amount ofresistance included in the motor circuit. Should the additionalresistance prevent starting of the motor, it is merely necessary totemporarily return the arm 5 to the position illustrated whereupon thestarting resistance is reduced to two steps.

In all of the above-described positions of the arm 5 said arm engagessegment 10 whereby the field circuit is completed exelusive of all ofthe resistance 1 This circuit may be traced from the arm 5 to segcuitand throughout the starting period.

When, however, the counter-voltage switch 3 responds, it shortcircuitsone section oi the Winding of switch l whereby said switch is permittedto open to include the selected amount of field resistance when thearmature current is reduced to a given value.

Thus the controller provides for inclusion of at least given amount ofarmature resistance and inclusion of all field resistance for startingWhile providing for reduction of the armature resistance and inclusionof the field resistance automatically upon proper acceleration oi themotor and moreover provides for increasing the amount or armatureresistance for speed reduction without interference with the automaticop oration.

As above set forth, if the motor fails to start with the additionalarmature resistance included in circuit the arm may be temporarilyplaced in the position illustrated and thereafter moved to include thedesired additional resistance.

. What I claim as new and desire to secure by Letters Patent is: Y

1. In a motor controller, in combination, a starting resistance for themotor circuit means operable automatically for excluding saidresistance, means to be set to maintain in circuit a variable amount ofsaid resistance and an additional resistance to be also in illuded bysaid last-mentioned means at W1 2. In a motor controller, incombination, an automatically responsive instrumentality and a rheostathaving resistance for the motor circuit. to be excluded by saidinstrumentalit'y, such resistance being included in the motor circuitfor starting regardless of the setting of said rheostat and beingsubject to exclusion by said instrumentality in memos:

varying amounts according to the setting of said rheostat, said rheostathaving additional resistance to be included in circuit with the motor atwill.

3. In a motor controller, in combination, an armature rheostat, a switchresponsive automatically to shunt a part of the resistance of saidrheostat, and circuit connections insuring inclusion in the motorcircuit of at least a given amount of the resistance of said rheostatprior to response of said switch and providing for inclusion in themotor circuit of additional resistance of said rheostat at will.

4. In a motor controller, in combination, a. rheostat, an associatedswitch having means for operating the same automatically subject to adelay, circuit connections insuring inclusion in the motor circuit of atleast a given amount of the resistance of said rheostat to be excludedby said switch in varying amounts according to the setting of saidrheostat and circuit connections for including in the motor circuitadditional resistanc of said rheostet according to adjustment of thelatter.

- 5. In combination an electric motor, a rheostat connected to saidmotor for inclusion in circuit with the latter of a given amount oi theresistance of said rheosat regardless oi the setting of the latter, saidrhecstat having additional resistance for in clusion in the motorcircuit at will and a switch having means to operate the someautomatically hut ect to a delay to exclude to varying degrees thefirst-mentioned portion of said resistance according to the adjustnientof said rheostat.

a motor controller, in combination, an automatically responsiveinstrumentality, a rhecstat having resistance to be included in themotor circuit subject to control by said instrumentality, said rheostathaving-contacts to vary the amount of resistance thereof included in themotor circuit, certain of such contacts being dependent upon response ofsaid instrumentality for connection thereof in circuit, said rheostatalso having other contacts engaged and disengaged according tothesetting of the former contacts, the latter contacts controlling acircuit providing for inclusion of at least a given amount of resistancein the motor circuit prior to responseof said means and connectionswhereby disengagement of said lattercontacts permits setting of theformer contacts to include in the motor circuit a, greater amount ofsaid resistance.

7. In a motor controller, in combination, an automatically responsiveinstrumentality, 12 and a rheostat having line and motor connections,certain of which are controlled by said instrumentality, said rheostatcomprising resistance contacts, a contact, arm having insulated sectionsone of which co-operates with said contacts to include a variaof by saidinstrumentality in varying;-- ble amount of the rheostat resistance inthe amounts according to the setting of said motor circuit and a contactengaged by the arm and for enabling inclusion of additional 10 othersection of said arm to make and break resistance at will by adjustmentof said arm.

5 a connection to the resistance at an interme- In witness whereof, Ihave hereunto subdiate point for insuring inclusion of at least scribedmy name, a given resistance subject to exclusion there- ALBERT J.HORTON.

